1. Prime Lens (FFL)- In film and photography, a prime lens is either a photographic lens whose focal length is fixed, as opposed to a zoom lens, or it is the primary lens in a combination lens system.
2. Wide- Angle Lens- In photography and cinematography, a wide-angle lens refers to a lens whose focal length is substantially smaller than the focal length of a normal lens for a given film plane.
3. Calypso underwater camera- The Calypso is equally suitable for water and air environment photography. It consists of two black enamelled cast alloy body parts; the one with all the internal parts is lowered into the outer shell.
4. Through-the-lens metering- Through-the-lens (TTL) metering is a photographic term describing a feature of cameras capable of measuring light levels in a scene through their taking lenses, as opposed to a separate metering window.
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